1-13/16" X 7/16" Pilot Hole HSS Taper Shank Counterbore Shopify Collective Internal Diameter: 1/2"-20

Internal Diameter: 1/2"-20

Pieces in Set 41

Size 2-1/2"-4

Part Number DWRRB3/4HEX

Star Drive Flat Head Trailer Floorboard Deck Screws

1-13/16" X 7/16" Pilot Hole HSS Taper Shank Counterbore Shopify Collective Internal Diameter: 1/2"-20Product Description Counterboring is the enlargement of a portion of a hole that has previously been formed. If the counterbored portion is shallow (1 8" or less), the operations is usually known as spot facing; for example, a flat seat for a bolt head or nut. If, on the other hand, the hole is enlarged to a considerable depth, it is designated as counterboring. These counterbores are made of two piece construction, having an integral shank and